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Leases - Lease-related Assets and Liabilities recorded on the Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Operating lease assets | $ 38 | $ 51
Finance lease assets | 170 | 141
Total lease assets | $ 208 | 192
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization |
Liabilities |  |
Current portion of operating lease liability | $ 15 | 20
Current portion of finance lease liability | 75 | 55
Noncurrent portion of operating lease liability | 28 | 38
Noncurrent portion of finance lease liability | 70 | 75
Long-term finance lease obligations | $ 188 | $ 188
Weighted-average remaining lease term |  |
Weighted-average remaining lease term, finance leases | 3 years 4 months 6 days | 3 years 5 months 26 days
Weighted-average remaining lease term, operating leases | 2 years 10 days | 2 years 5 months 8 days
Weighted-average discount rate |  |
Weighted-average discount rate, operating leases (percentage) | 5.00% | 5.00%
Weighted-average discount rate, finance leases (percentage) | 4.33% | 4.58%

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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